Re: Tesla Coil toroid Size

To: tesla-at-pupman-dot-com
Subject: Re: Tesla Coil toroid Size
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Wed, 16 Sep 1998 02:29:30 -0600
Approved: terryf-at-verinet-dot-com

Hi Cabbott,

> Original Poster: Cabbott Sanders <cabbott-at-cyberis-dot-net> 
> 
> 
> 
> Tesla List wrote:
> 
> > Original Poster: "Barton B. Anderson" <mopar-at-uswest-dot-net>
> >
> > John F,
> 
> > Quick question. Is it true that if the toroid is too
> 
> > large, that breakout will not occur? It sounds like your
> 
> > saying that a toroid can be too large and sparklength
> > may be smaller than a smaller toroid of correct size.
> >
> > Bart
> 
> Bart, i do believe that if a toroid is too large that it will absorb the
> discharges into it's capacitance, hindering output.  i have tried this
with my
> 60 mA coil and it holds true.  i am using a cheap salt water cap that gloes
> like
> a light when operating... which is my major loss factor of my system.
this in
> effect limits my discharge length to about 15".  put a toroid on top, and
> spark
> length is about 4" at most.
> 
> cabbott

Did you retune after changing your toroid? It is true that adding a 
larger Ctop will reduce Vout somewhat. However, I put a larger 
topload on a coil of mine and added another primary turn to retune
and scored an extra foot of spark for no extra input.

Malcolm